"It's one of the greatest will they-won't they's of all time," Tina Fey tells Yahoo Movies about the romantic fate of the world's two most famous muppets, Kermit and Miss Piggy. "It pre-dates Sam and Diane," she adds, referring of course to the great chase that played out across a bar counter between Ted Danson and Shelley Long in the classic '80s sitcom "Cheers."

Indeed, the Kermit and Piggy intrigue has been simmering for decades, unfolding as other famous couplings like Sam and Diane, Ross and Rachel, and Jim and Pam have come and gone.

Piggy, the world-class diva, has been trying convince Kermit, the band's leader, to put a ring on it since "The Muppet Show" began in 1976.

There has been some holy matrimony, of course, along the way, and without giving too much away, there is a wedding in their latest adventure, "Muppets Most Wanted."

But apparently nobody can tie this frog down. Kermit (who has said before that "I'm just an actor and when two actors marry on stage, they're only acting"), remains coy, as we witnessed during our recent interview.

"I will simply say that we are in a very committed, long-term relationship, and I think that is valuable," Kermit tells us.

Their co-star Ty Burrell ("Modern Family") has a theory: "I'm speaking for Kermit, and that's probably not my place. But I think he feels like he might get eaten alive," he tells us. "Well, not literally, because pigs don't eat frogs."